You have an air leak. More than likely at the fuel filter base. It could be the hose between the filter and the injection pump or any number of other places. You may also have a faulty lift pump. My local pump shop says there is a check valve that is supposed to stop reverse flow or bleed back to the tank in the lift pump. He says when that check valve fails, the filter being the highest spot in the fuel system gets a bubble, the larger leak or the longer it is parked, the problem gets worse. On one of my M1009s, I replaced the lift pump on his recommendation and it worked for about a week. Then my problem was back. I fought the issue for several months and finally bought a new filter base when mine got bad enough to start actually drip fuel. It has run perfectly since. The reason it starts and runs, then dies is the injection pump is still full of fuel and the hose below the intake is full of fuel. If it has leaked back, the filter will have an air bubble. When the air gets to the pump, it starves out and dies. Originally a little rpm would carry it through, but as it got worse, it would not. I used to bleed it every morning to get it started. Then it was in the morning and after work. Then it was in the morning, after work and anytime it sat for four hours. Eventually it got to where it needed bled after a couple of hours. Really frustrating. Glen